A Revision of the Uranotaenia of Panama with Notes on Other American Species of the Genus

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A Revision of the Uranotaenia of Panama with Notes on Other American Species of the Genus A Revision of the Uranotaenia of Panama with Notes on Other American Species of the Genus (Diptera, Culicidae) @Y PEDRO GALINDO, FRANKLIN S. BLANTON AND E. I,. PEYTON Reprinted from ANNALSOF THE ENTOMOLOGICALSOCIETY OF AMERICA, Vol. 47, No. 1, March, 1954. A REVISION OF THE URANOTAENIA OF PANAMA WITH NOTES ON OTHER AMERICAN SPECIES OF THE GENUS (Diptera, Culicidae) ’ PEDRO GALINDO,* FRANKLIN S. BLANTON,s AND E. L. PEYTON4 During the course of a light-trap mosquito survey in Panama, we had the opportunity of examining over nine thousand specimens of Uranotaenia and became impressed with the difficulties involved in the identification of the different species due to the inadequacy of the available treatises on the American species of the genus. Dyar (1928) published the last truly comprehensive work on the New World species of this interesting group of culicine mosquitoes and since that date only scattered descriptions of new species have appeared in the literature with the exception of Lanes’ (1943) attempt to bring up to date the information on South American species and the excellent publication by Pratt (1946) on the three species known to occur in Puerto Rico. At present, Dyars’ work is completely out of date due to the addition of many new species since its publication, to the inaccuracy of his descriptions and figures of the male terminalia and to the almost complete lack of information on the immature stages, and Lanes’ publication is incomplete and has the disadvantage of lacking keys for the separation of the different species. Thus the American species of Uranotaenia are evidently in need of a complete revision in the light of present day knowledge of the genus. The present work was originally planned as a revision of the American species of the genus, but in view of our inability to obtain adequate South American material, it was decided to publish it as a revision of the Uranotaenia of Panama, with additional notes on other species which became available to us during the study. Although our work is far from complete, it is hoped that publication of it at this time may serve to stimulate further taxonomic investigations on the subject. Lane (1939) records six species of Uranotaenia from Panama, namely: calosomata D. & K., coatzacoalcos D. & K., geometrica Lutz, hystera D. & K., Zowii Theobald and pulcherrima Lynch Arribalzaga. In the present publication we add eight new records for the country and describe four new species. For reasons that will be discussed under the species, we have come to the conclusion that coatzacoalcos does not occur in Panama, and that what has gone under that name in this country are in reality two species: typhlosomata Dyar and Knab Cost‘ of publication is paid by the Gorgas Memorial Laboratory. 2Entomologist, Gorgas Memorial Laboratory, Panama, R. de P. 3Lt, Colonel, MSC, Entomologist, United States Army Caribbean, Ft. Clayton, C. 2. 4Sergeant First Class, Preventive Medicine Technician, 25 Medical Dt. 107 108 Annals Entomological Society of America [Vol. 47 and trapidoi n. sp. The name Uranotaenia socialis Theob. has been revived to designate what has gone under the name of Uranotaenia sapphirina Osten Sacken in Middle America. We have also included in this paper a key to all the known American species of Uranotaenia. While we feel that little can be added in the way of new species or new records of Uranotaenia for Panama, our knowledge of the immature forms of many of the species remains fragmentary and much arduous field work is still required to reveal the breeding habits of them. METHODS The importance of the male terminalia in any taxonomic work on Uranotaenia cannot be overemphasized. The dististyle, phallosome and ninth tergite offer excellent characters for the separation of almost all the known species, but it is absolutely necessary to have adequate mounts in order to interpret correctly the different parts of the terrninalia. We have obtained excellent results with the following method modified after Fairchild and Hertig (1948). The terminal abdominal segments are clipped with a pair of fine scissorsbetween the seventh and eighth segments. The last segments with the terminalia are boiled in 20% KOH for fifteen to twenty seconds, then passed through a weak solution of HCL to neutralize the alkali and dropped into pure fresh phenol. The specimen is stained in a weak solution of acid fuschin in phenol for one to two hours and dissected in a small drop of the staining solution. In dissecting the specimen we separate first the eighth segment from the rest of the terminalia, then remove the styles and carefully tease the phallosome away from the ninth tergite; this last operation is very delicate and should be done with extreme care as the lobes of the ninth tergite have a tendency to come off with the phallosome, resulting in a poor specimen. To mount the terminalia we place very small dropplets of copal- phenol on a clean slide and place each part of the terminalia on an individual drop of the mounting medium. The eighth segment is mounted on a central uppermost drop followed by the two styles facing each other. Care should be taken that the styles are oriented in a true lateral position as a number of species are characterized by the dis- tended ventral border of the dististyle and this condition can only be seen in a true lateral view of the specimen. The styles are followed by the phallosome which may be mounted whole, in a dorso-ventral position, or the plates split apart and each mounted in lateral view. When more than one specimen are available it is better to have both dorsal and lateral views of the phallosome as some species have a number of teeth on the tergal arm of the phallosome that are obscured in dorsal view. The ninth tergite follows the phallosome; this sclerite should be mounted flat with the lobes pointing toward the phallosome so as to appreciate properly the shape of the lobes and of the emargina- tion of the basal border of the sclerite; this can be accomplished by separating the ninth tergite from the sternite through cuts on each side of the tergite. Four small pieces of cover-slip glass are then .placed around the mounted parts to act as supports for the cover-slip and thus avoid crushing of the specimen. 19541 Galindo et al.: Uranotaenia of Pan ama 109 Once the parts are properly mounted, the slide is placed in an oven at 40” C until all the phenol is driven off. A small drop of balsam is then placed on top of the copal and allowed to dry before putting on the cover-slip. This last step prevents movement and disorientation of the different parts of the terminalia. With this method excellent mounts are obtained in which all the parts can be adequately studied. We must emphasize on the necessity of dissecting the specimen, as whole mounts are totally inadequate since neither the phallosome nor the ninth tergite can be interpreted correctly in them. Uranotaenia Lynch Arribalzaga Uranokzenia Lynch Arribalzaga, 1891. Rev. Mus. La Plata, 1: 375. Type: #.kherrima Lynch Arribalzaga. Anisecheleomyiu Theobald, 1905. Ent., 38: 52. Type: nivipes Theobald. Pseudouranotueniu Theobald, 1905. Jour. Econ. Biol., 1: 33. Type: rowlandi Theobald. Pseudujiculhiu Theobald, 1912. Trans. Linn. Sot. Zool., 15: 89. Type: @unduni Theobald. GENERAL CHARACTERISTICS Small to very small mosquitoes with the following characteristics: very short Rz cell, much shorter than its petiole; anal vein ending at the same level of the fork of the cubitus.; extremely fine microtrichia of the wing membrane, usually only visible under the compound microscope. Head: Proboscis almost always swollen at its apex; palpi short to very short in both sexes. Clypeus and tori varying in color from yellow to dark brown according to the species. Antennae rather long in the females, usually, though not always, shorter and densely plumose in the males. Occiput clothed with flat ovoid scales and a few erect ones varying in color and arrangement according to the species. Thorax: Anterior pronotal lobes set wide apart, always with a patch or broad stripe of light scales in the known American species. Mesonotum with a vestiture of narrow, curved, dark scales and in the New World species with a line of broad, flat, bluish or white scales in the supraalar region, which in some species extends to the anterior margin of the scutum. Dorsocentral bristles numerous, very long and strong; achrosticals smaller and weaker but also numerous. Mid- lobe of scutellum with a patch of light scales in some species. Pleura mostly glabrous, with a stripe of light scales across the upper third of the sternopleuron in most American species. Pleural chaetotaxy as follows: three anterior pronotals, two above and one below; one or two propleurals, occasionally absent; one or two posterior pronotals; one to three spiraculars, occasionally absent in some specimens; no postspiraculars; one or two prealars; one to four upper sternopleurals; six or more lower sternopleurals; one to three upper mesepimerals, one lower mesepimeral. Suture between sternopleuron and prealar region quite marked. Paratergite always bare. Legs extensively marked with white in some species. Tibiae and tarsi showing secondary sexual modifications in the male of some African (Edwards, 1941) and Indian (Barraud, 1934) species and in at least two American species 110 Annals Entomological Society of America [Vol. 47 (Root, 1937, and see under nataliae in the present paper). Tarsal claws equal and simple except for midtarsal claws of the males of most New World species which are markedly subequal. Pulvilli absent. Wing-scales varying in color according to the species, mostly dark; a line of light scales along the stem vein and the bases of the costa, first and fifth vein in some species.
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